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FreeBSD-EN-15:06.file                                           Errata Notice
                                                          The FreeBSD Project

Topic:          Version and security update of file(1) and libmagic(3)

Category:       contrib
Module:         file
Announced:      2015-06-09
Affects:        All supported versions of FreeBSD.
Corrected:      2015-01-23 18:48:59 UTC (stable/10, 10.1-STABLE)
                2015-06-09 22:13:25 UTC (releng/10.1, 10.1-RELEASE-p11)
                2015-01-23 18:50:36 UTC (stable/9, 9.3-STABLE)
                2015-06-09 22:13:53 UTC (releng/9.3, 9.3-RELEASE-p15)
                2015-05-09 23:53:25 UTC (stable/8, 8.4-STABLE)
                2015-06-09 22:13:53 UTC (releng/8.4, 8.4-RELEASE-p29)
CVE Name:       CVE-2014-0207, CVE-2014-3478, CVE-2014-3479, CVE-2014-3480,
                CVE-2014-3487, CVE-2014-3538, CVE-2014-3587, CVE-2014-9620,
                CVE-2014-9621, CVE-2014-9653

For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.freebsd.org/>.

I.   Background

The file(1) utility attempts to classify file system objects based on
filesystem, magic number and language tests.

The libmagic(3) library provides most of the functionality of file(1)
and may be used by other applications.

II.  Problem Description

There are a number of denial of service issues when handling complex
files, for instance Portable Executable (PE) files and ELF files parsing
code with libmagic(3) and in turn file(1).

III. Impact

An attacker who can cause file(1) or any other applications using the
libmagic(3) library to be run on a maliciously constructed input can
cause the application to crash or consume excessive CPU resources,
resulting in a denial-of-service.

IV.  Workaround

System administrators who run file(1) and libmagic(3) against untrusted
files, for instance when running with a mail server's mail scanner, are
advised to configure the scanner in a way so that they do not call file(1)
or libmagic(3) to conduct deep inspection of input files.  Most of these
scanners does not really need the in-depth analysis and the file type
determined by libmagic is already sufficient.

V.   Solution

This errata replaces the base system file(1) and libmagic(3) with the
version 5.22.

Perform one of the following:

1) Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.

2) To update your present system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

3) To update your present system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

[FreeBSD 10.1]
# fetch https://security.FreeBSD.org/patches/EN-15:06/file-10.1.patch
# fetch https://security.FreeBSD.org/patches/EN-15:06/file-10.1.patch.asc
# gpg --verify file-10.1.patch.asc

[FreeBSD 9.3]
# fetch https://security.FreeBSD.org/patches/EN-15:06/file-9.3.patch
# fetch https://security.FreeBSD.org/patches/EN-15:06/file-9.3.patch.asc
# gpg --verify file-9.3.patch.asc

[FreeBSD 8.4]
# fetch https://security.FreeBSD.org/patches/EN-15:06/file-8.4.patch
# fetch https://security.FreeBSD.org/patches/EN-15:06/file-8.4.patch.asc
# gpg --verify file-8.4.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

Restart all deamons using the library, or reboot the system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/8/                                                         r283135
releng/8.4/                                                       r284194
stable/9/                                                         r277593
releng/9.3/                                                       r284194
stable/10/                                                        r277592
releng/10.1/                                                      r284193
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0207>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3478>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3479>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3480>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3487>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3538>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3587>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9620>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9621>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9653>

The latest revision of this Errata Notice is available at
https://security.FreeBSD.org/advisories/FreeBSD-EN-15:06.file.asc
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